public function addEvent(EventModel $event)
 {
     if (!$event->getSlug()) {
         $this->warnings[] = new DataWarningEventHasNoSlug();
         $event->createSlug();
     }
     if ($this->siteContainer['eventrepository']->loadBySlug($event->getSlug())) {
         $this->errors[] = new DataErrorTwoEventsHaveSameSlugs();
     }
     if ($event->getStart()->getTimestamp() > $event->getEnd()->getTimestamp()) {
         $this->errors[] = new DataErrorEndBeforeStart();
     }
     $this->siteContainer['log']->info("Adding event", array('event' => $event->getDataForLoggerInfo()));
     $this->siteContainer['eventrepository']->create($event);
 }